Know Your Environment. Protect Your Health.

Nitrate and nitrite

West Monroe Water System

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

 

52

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0583 ppm122ND - 0.350 ppm
20190.0119 ppm142ND - 0.0830 ppm
20200.0400 ppm102ND - 0.200 ppm
20210.200 ppm550.200 ppm
2022ND60ND
20230.1000 ppm52ND - 0.300 ppm

ppm = parts per million

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.14 ppm

The EWG health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL): 10 ppm

ppm = parts per million

All test results

Date Lab ID Result
2018-07-1635405319001ND
2018-07-1635405319001ND
2018-10-1635424738009ND
2018-10-1635424738004ND
2018-10-1635424738003ND
2018-10-16354247380010.350 ppm
2018-10-1635424738002ND
2018-10-1635424738003ND
2018-10-1635424738004ND
2018-10-1635424738009ND
2018-10-1635424738002ND
2018-10-16354247380010.350 ppm
2019-12-0235517000001ND
2019-12-0235517000001ND
2019-12-0635518124006ND
2019-12-06355181240020.0830 ppm
2019-12-0635518124001ND
2019-12-0635518124005ND
2019-12-0635518124004ND
2019-12-0635518124003ND
2019-12-06355181240020.0830 ppm
2019-12-0635518124001ND
2019-12-0635518124006ND
2019-12-0635518124005ND
2019-12-0635518124004ND
2019-12-0635518124003ND
2020-02-17B2000817-004ND
2020-02-17B2000817-003ND
2020-02-17B2000817-002ND
2020-02-17B2000817-001ND
2020-06-05B2002833-001ND
2020-08-19B2004170-0050.200 ppm
2020-08-19B2004170-008ND
2020-08-19B2004170-0070.200 ppm
2020-08-19B2004170-006ND
2020-08-19B2004170-009ND
2021-06-15B2102723-0020.200 ppm
2021-06-15B2102723-0030.200 ppm
2021-06-15B2102723-0040.200 ppm
2021-06-15B2102723-0050.200 ppm
2021-06-15B2102723-0060.200 ppm
2022-02-21B2200773-004ND
2022-02-21B2200773-001ND
2022-02-21B2200773-002ND
2022-02-21B2200773-003ND
2022-12-06B2205819-002ND
2022-12-06B2205819-001ND
2023-06-20B2302495-004ND
2023-06-20B2302495-005ND
2023-06-20B2302495-0060.300 ppm
2023-06-26B2302590-0050.200 ppm
2023-06-26B2302590-006ND